body {
    background: #F3F3F3;
    background-size: cover;
    font-size: 16px;
    margin-top: 10px
}

.center-show {
    margin-top: 30px;
    border: 1px solid #8c8c8c;
    background: #ffffff;
    height: auto;
    width: 100%;
    padding-top: 40px;
    padding-bottom: 20px;
}

.tip-success {
    margin-top: 10px;
    color: #222222;
    font-size: xx-large;
    padding: 20px;
}

#div-success {
    margin-top: 20px;
}

.center-tip {
    margin-top: 20px;
    border: 1px solid #31b0d5;
    background: #ffffff;
    height: auto;
    width: auto;
    margin-right: 30px;
    margin-left: 30px;
}

.label-1 {
    padding-top: 10px;
    padding-bottom: 10px;
    width: 100%;
    font-size: larger;
    background: #43A9F3;
    font-style: normal;
    color: #0E18A3;
}

.label-2 {
    padding-top: 10px;
    padding-bottom: 10px;
    padding-left: 10px;
    width: 100%;
    font-size: large;
    text-align: left;
    background: white;
    font-style: inherit;
    color: #43A9F3;
}

.btn-study {
    margin-top: 30px;
    height: 50px;
    color: #ffffff;
    width: 80%;
    font-size: larger;
    background: #FB6703;
}
.btn{
    color: #ffffff;
}
.reply-tip {
    margin-top: 20px;
    border: 1px solid #31b0d5;
    background: #ffffff;
    height: auto;
    width: auto;
    margin-right: 30px;
    margin-left: 30px;
}

.label-3 {
    color: #262626;
    font-size: 14px;
    text-align: left;
    padding: 20px 10px 20px;

}

.btn-completion {
    margin-top: 30px;
    margin-left: 50px;
    margin-right: 50px;
    width: 80%;
    height: 50px;
    color: #262626;
    background: #5e5e5e;
}